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Repronex® (Menotropins for Injection

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Repronex® (Menotropins for Injection REPRONEXÒ (MENOTROPINS FOR INJECTION, USP) FOR SUBCUTANEOUS INJECTION AND INTRAMUSCULAR INJECTION DESCRIPTION RepronexÒ (menotropins for injection, USP) is a purified preparation of gonadotropins extracted from the urine of postmenopausal women. Each vial of RepronexÒ contains 75 International Units (IU) or 150 IU of follicle-stimulating hormone (FSH) activity and 75 IU or 150 IU of luteinizing hormone (LH) activity, respectively, plus 20 mg lactose monohydrate in a sterile, lyophilized form. The final product may contain sodium phosphate buffer (sodium phosphate tribase and phosphoric acid). RepronexÒ is administered by subcutaneous or intramuscular injection. Human Chorionic Gonadotropin (hCG), a naturally occurring hormone in post-menopausal urine, is detected in RepronexÒ. RepronexÒ is biologically standardized for FSH and LH (ICSH) gonadotropin activities in terms of the Second International Reference Preparation for Human Menopausal Gonadotropins established in September, 1964 by the Expert Committee on Biological Standards of the World Health Organization. Both FSH and LH are glycoproteins that are acidic and water soluble. Therapeutic class: Infertility. CLINICAL PHARMACOLOGY Menotropins administered for 7 to 12 days produces ovarian follicular growth in women who do not have primary ovarian failure. Treatment with menotropins in most instances results only in follicular growth and maturation. When sufficient follicular maturation has occurred, hCG must be given to induce ovulation. Page 1 PHARMACOKINETICS Single doses of 300 IU menotropins (Menogon®, Ferring’s European formulation) were administered subcutaneously (SC) and intramuscularly (IM) in a 2-period crossover study to 16 healthy female subjects while their endogenous FSH and LH were being suppressed. Serum FSH concentrations were determined. Based on the ratio of FSH Cmax and AUC 0-µ, SC and IM administration of menotropins are not bioequivalent. Compared to IM administration, the SC administration of menotropins results in an increase of FSH Cmax and AUC0-µ by 35 and 20%, respectively. Based on two subjects who received either the highest SC or IM RepronexÒ dose, FSH pharmacokinetics (PK) appears to be linear up to 450 IU menotropins. The mean accumulation factors for FSH upon six doses of SC or IM 150 to 450 IU/day RepronexÒ are 1.6 and 1.4, respectively. Upon six doses of SC or IM 150 IU/day RepronexÒ, the observed serum FSH concentrations range from 1.7 to 15.9 mIU/mL and 0.5 to 10.1 mIU/mL, respectively. The FSH pharmacokinetic parameters from population modeling for these two studies are in Table 1. Table 1. FSH Pharmacokinetic Parameters† Upon Menotropins Administration Single Dose‡ Multiple Dose¶ FSH Parameter SC IM SC IM -1 Ka (h ) 0.128 (42.1) 0.117 (21.3) 0.076 (46.3) 0.064 (63.2) C1/F (L/h) 0.770 (17.1) 0.94 (6.9) 1.11 (39.5) 1.44 (43.5) V/F (L) 39.37 (14.1) 57.68 (11.4) 23.09 (8.3) 23.5 (2.5) † mean (CV%) ‡ Menogon® (Ferring’s European formulation of menotropins) ¶ Repronex® Serum LH concentrations upon multiple dose SC or IM RepronexÒ are low and variable. No recognizable trend in the increase in serum LH concentrations from SC or IM 150 to Page 2 450 IU/day RepronexÒ doses was observed. After the 6th dose of SC or IM 150 IU/day RepronexÒ, the range of baseline-corrected serum LH concentrations is 0 to 3.2 mIU/mL for both routes of administration. Absorption The geometric mean of FSH Cmax and AUC0-µ upon single dose SC administration of menotropins is 5.62 mIU/mL and 385.2 mIU·h/mL, respectively; the corresponding geometric median of FSH tmax is 12 hours. The geometric mean of FSH Cmax and AUC 0-µ upon single dose IM administration of menotropins is 4.15 mIU/mL and 320.1 mIU·h/mL, respectively; the corresponding geometric median of FSH tmax is 18 hours. Distribution Human tissue or organ distribution of FSH and LH have not been studied for RepronexÒ. Metabolism Metabolism of FSH and LH have not been studied for RepronexÒ in humans. Excretion The mean elimination half-lives of FSH upon single dose SC and IM administration of menotropins are 53.7 and 59.2 hours, respectively. Pediatric Populations RepronexÒ is not used in pediatric populations. Page 3 Geriatric Populations RepronexÒ is not used in geriatric populations. Special Populations The safety and efficacy of RepronexÒ in renal and hepatic insufficiency have not been studied. Drug Interactions No drug/drug interaction studies have been conducted for RepronexÒ in humans. CLINICAL STUDIES Efficacy results for two randomized, active controlled, multi-center studies in in vitro fertilization (IVF) and ovulation induction (OI) are summarized in tables 2 and 3. The patients underwent pituitary suppression with a GnRH agonist before starting Repronex® administration. The first study evaluated 186 patients undergoing IVF who received 225 IU Repronex® daily for 5 days. This was followed by individual titration of the dose from 75 to 450 IU daily based on ultrasound and estradiol (E2) levels. The total duration of dosing did not exceed 12 days. The second study evaluated 108 patients who received 150 IU Repronex® daily for 5 days. This was followed by individual titration of the dose from 75 to 450 IU daily based on ultrasound and estradiol (E2) levels. The total duration of dosing did not exceed 12 days. Page 4 Table 2. Efficacy Outcomes by Treatment Group for IVF (one cycle of treatment) Parameter RepronexÒ IM RepronexÒ SC N=65 N=60 Total oocytes Retrieved 13.6 12.7 Mature oocytes Retrieved 9.4 8.6 Pts w/oocyte Retrieval (%) 61(93.8) 55 (91.7) Pts w/Embryo Transfer (%) 58(89.2) 51(85.0) Pts w/Chemical Pregnancy (%) 31(47.7) 35(58.3) Pts w/Clinical Pregnancy (%) 25(38.5) 30(50.0) Pts w/Continuing Pregnancy (%) 24(36.9) 1. 29(48.3) 2. Pts. w/Live Births (%) 22(33.8) 3. 25(41.7) 4. 1. Continuing pregnancies included 14 single, 7 twins, and 3 triplet pregnancies. 2. Continuing pregnancies included 14 single, 9 twins, 3 triplets, and 3 quadruplet pregnancies. 3. Total of 34 live births. One spontaneous abortion. The follow-up data is not available for one patient. 4. Total of 39 live births. Two spontaneous abortions. The follow-up data is not available for two patients. Table 3. Efficacy Outcomes by Treatment Groups in Ovulation Induction (one cycle of treatment) Parameter RepronexÒ IM RepronexÒ SC N=36 N=36 Ovulation (%) 23 (63.9) 25 (69.4) Received hCG (%) 25 (69.4) 27 (75.0) Mean Peak Serum E2 (SD) 1158.5 (742.3) 1452.6* (1270.6) Chemical Pregnancy (%) 4 (11.1) 11 (30.6) Clinical Pregnancy (%) 4 (11.1) 6 (16.7) Continuing Pregnancy (%) 4 (11.1) 1. 6 (16.7) 2. Pts. w/Live Births (%) 4(11.1) 3. 4(11.1) 4. * Fisher’s Exact/Chi-Squared Tests – significant for Repronex SC vs. Repronex IM 1. Continuing pregnancies included 2 single and 2 triplet pregnancies. 2. Continuing pregnancies included 3 single, 1 twin and 2 quadruplet pregnancies. 3. Total 6 live births 4. Total of 6 live births. One spontaneous abortion. The follow-up data is not available for one patient. Page 5 INDICATIONS AND USAGE Repronex®, in conjunction with hCG, is indicated for multiple follicular development (controlled ovarian stimulation) and ovulation induction in patients who have previously received pituitary suppression. Selection of Patients 1. Before treatment with RepronexÒ is instituted, a thorough gynecologic and endocrinologic evaluation must be performed. Except for those patients enrolled in an in vitro fertilization program, this should include a hysterosalpingogram (to rule out uterine and tubal pathology) and documentation of anovulation by means of basal body temperature, serial vaginal smears, examination of cervical mucus, determination of serum (or urine) progesterone, urinary pregnanediol and endometrial biopsy. Patients with tubal pathology should receive menotropins only if enrolled in an in vitro fertilization program. 2. Primary ovarian failure should be excluded by the determination of gonadotropin levels. 3. Careful examination should be made to rule out the presence of an early pregnancy. 4. Patients in late reproductive life have a greater predilection to endometrial carcinoma as well as a higher incidence of anovulatory disorders. Cervical dilation and curettage should always be done for diagnosis before starting RepronexÔ therapy in such patients who demonstrate abnormal uterine bleeding or other signs of endometrial abnormalities. 5. Evaluation of the husband's fertility potential should be included in the workup. Page 6 CONTRAINDICATIONS RepronexÒ is contraindicated in women who have: 1. A high FSH level indicating primary ovarian failure. 2. Uncontrolled thyroid and adrenal dysfunction. 3. An organic intracranial lesion such as a pituitary tumor. 4. The presence of any cause of infertility other than anovulation unless they are candidates for in vitro-fertilization. 5. Abnormal bleeding of undetermined origin. 6. Ovarian cysts or enlargement not due to polycystic ovary syndrome. 7. Prior hypersensitivity to menotropins. 8. RepronexÒ is not indicated in women who are pregnant. There are limited human data on the effects of menotropins when administered during pregnancy. WARNINGS RepronexÒ is a drug that should only be used by physicians who are thoroughly familiar with infertility problems. It is a potent gonadotropic substance capable of causing mild to severe adverse reactions in women. Gonadotropin therapy requires a certain time commitment by physicians and supportive health professionals, and its use requires the availability of appropriate monitoring facilities (see PRECAUTIONS - Laboratory Tests). In female patients it must be used with a great deal of care. Page 7 Overstimulation of the Ovary During RepronexÒ Therapy Ovarian Enlargement: Mild to moderate uncomplicated ovarian enlargement which may be accompanied by abdominal distension and/or abdominal pain occurs in approximately 5 to 10% of those treated with RepronexÒ menotropins and hCG, and generally regresses without treatment within two or three weeks.
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